Global Navigation Satellite System (GNSS) users can benefit from additional information about qualitative or quantitative characteristics of data before their processing. Also a selection of stations for each use case can be optimized on the basis of quality control (QC) metadata. Moreover, data providers are interested in a feedback about actual data quality and content. For all the above purposes, the G-Nut/Anubis software has been developed at the Geodetic Observatory Pecny (GOP), in particular for supporting needs of recently established multi-GNSS world. The Anubis version 2.2 enables users to process all available GNSS observations from files in the RINEX 2/3 format. Developments of real-time applications has raised a request for monitoring data distributed via data streams in real-time. Since there are not many suitable tools, we improved the G-Nut/Anubis for this purpose and we initiated a service for monitoring NTRIP streams of selected IGS stations. The BKG NTRIP Client (BNC) is used initially for decoding RTCM observations. Selected key parameters have been calculated and QC results from real-time streams are compared to QC results produced offline using either official daily RINEX observations or observations stored in RINEX format from real-time streams. Finally, we present some issues raised from this comparison.